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Commit 9f65df9c authored by Geert Uytterhoeven's avatar Geert Uytterhoeven Committed by Takashi Iwai
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ALSA: firewire-tascam: Fix integer overflow in midi_port_work()



As snd_fw_async_midi_port.consume_bytes is unsigned int, and
NSEC_PER_SEC is 1000000000L, the second multiplication in

    port->consume_bytes * 8 * NSEC_PER_SEC / 31250

always overflows on 32-bit platforms, truncating the result.  Fix this
by precalculating "NSEC_PER_SEC / 31250", which is an integer constant.

Note that this assumes port->consume_bytes <= 16777.

Fixes: 531f4718 ("ALSA: firewire-lib/firewire-tascam: localize async midi port")
Reviewed-by: default avatarTakashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20210111130251.361335-3-geert+renesas@glider.be


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent e7c22eea
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